▎ 摘　　要

In this work, nanocrystalline cellulose (NCC)/polyvinylidene fluoride (PVDF) ultrafiltration composite membranes reinforced with graphene oxide (GO) were successfully prepared by the Loeb-Sourirajan phase inversion process. Firstly, the effects of mutual interactions between GO and NCC on membrane surface structure, morphology, and performance were investigated in detail. The existence of hydrogen bonds between GO and NCC in the membrane was confirmed by Fourier-transform infrared spectroscopy. The morphology of the membranes was observed by scanning electron microscopy. The water flux, bovine serum albumin rejection, and attenuate coefficient of the membranes were determined to investigate the filtration performance, and the filtration performance was hardly affected with addition of GO. The NCC/PVDF membrane modified with 1.0 wt% GO showed the highest tensile strength of 9.56 MPa, which was 58.01% higher than that of the unmodified membrane. Thermogravimetric analysis indicated that the blend membranes modified with GO had higher thermal stability compared with the unmodified NCC/PVDF membrane. When the NCC content was 0.5 wt% and the GO content was 1.0 wt% (the content of GO was based on the weight of PVDF), the optimized performance could be obtained due to the formation of hydrogen bonds between GO and NCC.